furrer



Original Filed April 20, 1929 5 Sheets-Sheet 1 A33 /35 r4 TTO/P/VE XJune 4, 1935. s. s. FL JRRER 19593 DISK HARROW Original Filed April 20,1929 5 Sheeizs-Sheet 2- 35 3a 9 v Z June 4, 1935. s. s. FURRER Re.19,598

DISK HARROW Original Filed April 20, 1929 5 Sheets-Sheet 3 Jamuc/ s5.Raver 8. S. FURRER June 4, 1935.

DISK HARROW 5 Sheets-Sheet 4 Original Filed April 20, 1929 Jun 4, 1935.s. s. FURRER Y Re. 19,598

DI SK HARROW' Original Filec i April 20, 1929 5 Sheets-Sheet 5 //V VENT0E: jomue/ J a Reissued June 4, 1935 Re.,l9, 598

DISK HARROW Samuel S. Furrer, Oxnard, Calii'., assignor to Brenneis'Manufacturing Company,

Oxnard,

Calif., a corporation of California Original No. 1,861,741, dated June7, 1932, Serial No. 356,832, April 20, 1929. Application for reissueMarch 19, 1935, Serial No. 11,897

15 Claims.

My invention relates to disk harrows and more particularly to a novelharrow of the two-gang type, such as is shown in my Letters PatentNumber 1,781,171, granted November 11, 1930, of which this applicationis a continuation in part.

In the cultivating of orchards with disk harrows it has been founddifficult to cultivate underneath trees having .foliage which extendsclose to the ground because the harrows in use at present followdirectly after the tractor by which they are drawn It thus becomesnecessary for the tractor topass close to the trunk of the tree underwhich it is desired to work the ground and the tractor is of such heightthat the foliage of the tree is frequently damaged.

It is one of the principal objects of my invention to provide a harrowwhich is of relatively low height and which is adapted to work ground ina path which extends to one side of the path of the tractor which drawsthe harrow. With a harrow of this type the ground may be worked beneathlow hanging foliage without the necessity of thrusting the foliage asideby the passage of the tractor therebeneath, and consequently the dangerof damaging the foliage is practically eliminated.

In most of the disk harrows as previously made, a front gang element anda rear gang element are connected together and drawn by a tractor insuch a manner that a relative movement between the tractor and a portionof one of the front or rear gang elements will cause the shifting ofthese elements relative to each other so that row a considerabledistance which makes the handling of such'a harrow in a small space avery awkward matter.

It is a further object of my invention to provide a two-gang harrow inwhich the gangs may be shifted relative to each other between workingand non-working positions by a comparatively short movement of thetractor.

It is a still further object of my invention to provide a two-gangharrow which may be easily controlled so that it will either trailbehind the gage the earth equally throughout its length when the harrowis in working position.

Another feature of harrows as made at present which prevents their beingused for cultivating beneath low hanging foliage in an orchard is thepresence upon the harrow of levers or other parts which extend upwardfrom the harrow on portions of the harrow which might otherwise passeasily beneath saidv foliage., It is therefore an object of my inventionto provide a disk harrow which is adapted for cultivating beneath lowhanging foliage in an orchard and which is free from members extendingabove the disks of the harrow excepting at the side of the harrow whichis disposed away from the trees under which the harrow is adapted tocultivate.

Further objects and advantages will be made manifest in the followingdescription and in the accompanying drawings, in which Fig. 1 is a planview of a preferred embodiment of the harrow of my invention in anonworking position. I

Fig. 2 is a view similar to Fig. 1 and shows the harrow in a workingposition.

Fig. 3 is a view similar to Figs. 1 and 2 and shows the harrow in adifferent working position from that in which it is shown in Fig. 2.

Fig. 4 is a side elevational view of theharrow and'is taken in thedirection of the arrow 4 of Fig. 5 is a front view of a detail along theline 55 of Fig. 1.

Fig. 6 is a vertical sectional view taken on the line 6-6 of Fig. 1. n

Fig. '7 is a fragmentary perspective view of portions of the frameworkof the harrow in which the connection between the front gang andinter-gang yoke is more clearly illustrated.

-Figs. 8 to 11 inclusive are diagrammatic plan views illustrating thevarious positions in which the harrow of my invention may be drawn by atractor.

Referring to the drawings in detail, a harrow l5, as shown in Fig: 1,includes a rear gang IS, a front gang [1, an inter-gang yoke l8, and adraft yoke l9.

The rear gang I6 includes two series of gangs .of disks 22 mounted uponaxles 23 which are journalled in bearing blocks 21 held on a main framebar 25. The main frame bar 25 is bent to form a transverse bar 26 andside bars 21 and 28. The rearmost portions 29 and 30 of the side bars 21and 28 are twisted into horizontal position and provide ends for arectangular box-like frame 3| which includes transverse angle irons 33and 34 which connect the side bar portions 29 and 36. Intermediate bars35 are connected, as by spot welding or riveting, to the central bearingblocks 24 and at their forward ends 36 '5 to a transverse stiffeningmember 41 held to the side bars 21 and 26 by rivets 44.

The intermediate bars 35 are twisted at their rear ends to formhorizontal portions 31 which are attached td'the transverse angleirons33 and 34 intermediate their ends. The frame 3| may,

be suitably braced by diagonal strips 33.. i V

The main frame bar 25, the member 41, bars 33, 34, and 35 comprise arear gang control frame 46, the portions of'the side bars 21 and 26extending beyond the connections of member 41 therewith being bent toform side bars 45 for the transverse bar 26, and bar 26 and member 41are braced by an 5 bar 56 adapted to be connected at itsnodes with bar26 and member 41 by rivets or other suitable means.

A's particularly illustrated in Figs. 1 and 5, the 8 bar 56 is held tobar 26 by a bracket 32 having a plurality of adjusting holes 46 thereinto co-act with similar holesin the bar 26, whereby the bracket may, belaterally moved with respect to the bar 26 by removing and changing theposition of bolts 36. The bracket 32 is constructed to have a verticalhole 5| therein for a purpose to be later described, and the center ofthe hole 5| is disposed close to the fore and aft central axis A-A ofthe rear gang I6. An arm 52 is welded or bolted to one of the side bars45 and preferably extends outwardly beyond the outermost of the disks 22of the rear gang I6 to pivotally hold mechanism to be later described.

The front gang," has two series of gangs of disks 66 mounted upon axles6I which are journalled in bearing blocks 62 which are held by I foreand aft bars 65. The rear end portions 61 of bars 65 are twisted to liein a horizontal plane and are connected by transverse angle irons 66 anddiagonal members 66 to form a frame 16,

substantially identical with the frame 3| of the rear gang I6, eachframe being fashioned at its rear end to form a weight box. The extremeforward ends of the bars 65 are bent to lie in a, horizontal plane andare connected by rivets 15 to upper and lower forward transverse bars16.

The connection'between the frames 3| and 16 includes an inter-gang yokeI6 comprising upper and lower guide bars 32 of the same size and shape,each being bent to form long and. short legs 66 and 61 connected by acurved portion 86. The included angledaetween the long leg 66 and thebar 26 is substantially equal to the maximum angle to which the reargang I6 is angled when in working position, and the bars 62 are held inspaced relation by a tube-and-rivet spacer element 96, the distancetherebetween being such as to permit entry of bar 26 and the bracket 32between the upper-and lower guide bars 62.

The upper guide bar 62 is bent down at each end and bracket straps 86are secured tightly at one end between the guide bars 62 by a tight bolt11, the other. ends of the straps 66 being pivotally'secured to dropmembers 16 bolted to the outside fore and aft bars 65 of the frontceivea bolt which passes through both the guide bars 62 and the vertical bore5| of the bracket 32. The bolt 95 has a bushing surrounding its shankwithin the bore 5|, so that the bolt 65 may be tightened and stillpermit. horizontal movement of the rear frame'3l.

The pivot bolts 64 are-likewise hushed to permit a relative flexibilitybetween the front and rear gangs I1 and I6.

It will thus be seen that the rear and front gangs I6 and I1 may bemoved pivotally relative to each other about the bolt 65 and the bolts'64, but-the inter-gang yoke I3 prevents any great the horizontal bolts64 which is desired when.

passing over obstructions to prevent twisting of the frame members, ,thedraft from the front frame 16 to the rear frame 3| being applied throughthe bolts 84 and 95.

The draft yoke includes a main draft link I66 and a lateral brace I6 Iwhich latter is adjustable in length. A plate I62 is formed by turningout the forward end of the drop member 18 and supports a threaded studI63 which is bushed to receive and horizontally pivotally hold theinnerend of the link I66 by means of a nut I64. A pair of draft linkguide bars I66 are held in spaced relation by suitable tube and boltspacers I61, the lowermost of the bars I66 being suitably fastened, asby welding, to the uppermost of the transverse bars 16 of the frontframe 16, the link I 66 being held between the bars I66 to permithorizontal movement thereof between'the spacer held in spaced relationthereto by tube and bolt.

spacer members II4.

-The plates H6 and III extend towards the fore and aft central axis B-Band have holes I3| to receive a pivot bolt- I I5 forsupporting theforward end of a bar 6 forming part of the.

brace I6I, andin this manner the brace I6I may be pivotally held on themain draft link I66, as described inmy aforesaid Letters Patent, but apreferred method of attaching the bar H6 to the draft yoke l3 to give anew mode of operation will be herein set forth.

- The bar 6 is provided with a plurality of holes 1 through which it isadjustably connected by bolts H6 to. a bar II9 having a plurality ofholes I26, the two joined bars forming the brace IN, and the rear end ofthe bar H6 being disposed between the bars 16 of the front frame 16 andpivotally secured therebetween by a bolt I2I which passes throughsuitable apertures in the bars 16 and H6.

The body plate III is divided. into two portions to provide a centralslot I65 formed by vertical lugs I22 on the bases II3 spaced by aplurality of tube and bolt members I66, on one of connected at one'endto a adapted to tractor I10, as illustrated in One end of the lever pawlH2 is formed of two members I30 spaced by tube and bolt members I23 enone of which is held one end of a tension spring I30, the other end ofthe spring I30 being fastened to one of the members I03 within the slotI05. The lever pawl H2 includes members I38, a solid portion I24fulcrumed at the bolt I09, and a solid portion I25 having an oriflce I26at its opposite end. The portion I24 is be held in engagement withdepressions I21 of a toothed ratchet member I28 rigidly fastened to asliding draft link I50 by the tension of the spring I30, which tensionmay be removed by pulling on a cord I40 fastened in the orifice I25 andexercised by the driver of a tractor, to which the harrowl5 is attached,from'his seat thereon.

The sliding draft link I50 is adapted to lie upon the upper face of theforward portion of the main draft link I so that the forward end of thelink I50 extends between the draft'link I00 and the bases II3, theratchet member I20 extending through the slot I below the bolts I09.-

A loop I23, comprising a piece of metal bent to form upper and lowerportions of equal size, is bolted to the forward end of the sliding linkI50 by bolts I32 and has extensions thereon apertured to receive thebolt I I5 and pivotally support the brace ml in a preferred position.

The loop I29 is connected to a clevis -I33 by a pivot bolt I34, to theend that a bolt may pass through the holes I35 and thus connect the im-'plement to the draw-bar of a tractor, the bolt in holes I35 and the.bolt I34 thus providing a uni-. versal joint movement.

A sliding link guide member I36 has a lower. plate I31 welded to themain draft link I00 and has an upper arched member I33 connected theretoby tube and bolt spacer members I for the purpose of holding the linksI00 and I50 in alignment.

A second guide member I55 is provided atthe rear end of the link I50 tomaintain the links I00 and I50 in alignment and also to providea'connection to the rear gang I5. This is accomplished by welding aplate I40 to the sliding draft link I50 on its upper face andsuitably'fastening plate I42 below the draftlink I 00 and plate I43above plate I40 by tube and bolt spacer members I44, a central bolt I41being adapted to extend through plates I43 and I43 and hold a. bracketI45 forpivotal movement thereon in a horizontal plane. H

The guide members I35 and I55 and the slot I05 provide that free slidingmovement between the links I00 and I50 is assured in a relatively fixedposition.

' An angling bar I53 is adapted to be pivotally bracket I45 by a'boltI45, the bar I63 being bent to clear frames 3| and 10, and has its rearend bent inwardly to form a foot I55 resting on the arm 52 fastened tothe side bar 46 of the rear frame 3|, and pivotaily connected. theretoby a bolt I01.

The operation of my disk harrow is as follows: when theparts of theharrow I5, are assembled as shown in Fig. 1, the harrow is connected bya pin through holes Fig. 10. The-harrow is then in a lateral, or offset;non-working. position L. The path of the tractor I is indicated by theletter C in Figs. 8 to 11 inclusive.

I1 are substantially paral The two gangs I5 and I35 to the draw-bar of ale] and follow a path D, when drawn in position L-, which isapproximately the central fore and aft axis of the'harrow I5 as a whole,and which is considerably to one side of the tractor path C. In thisposition the disks .22 of the rear gang I5 will ordinarily follow in thetracks of the disks 500i thefront gang I1, but, according to theadjustment of the bracket 32 as shown in Fig. 1, may be a little to oneside for a reason to be presently explained.

Upon advancement of the tractor I10, harrow I5 will follow on the pathtractor being applied through the yoke l9, frame 10, pivots' 84, and theinter-gang yoke I8 to the rear frame 3| through the pivot 95.'

It should be particularly noted that the pivot 95 is close to thecentral fore and aft axis of the harrow as a whole but is much closer tothe axles '23 of the rear gang I6 than to the axles 5| of the front gangI1. This latter position is especially desirable in order to pull thegangs into correct working relation and the former position from thepivot 35 to 46,|so that 9.

provides a long lever arm, the pivot I61 through the frame minimum draftis required to pull and hold the rear frame in working angle.

The length of such lever armisfapproximately one-half the length of therear frame 46 transversely of its central fore and aft axis.

By additionally referring to Fig. 6 it will be seen that, the pull of.the tractor I10 being applied to the front frame 10 through the slidinglink I50 and the main draft link I00, the position of the portion I24 ofthe lever pawl I I2 with respect to the grooves I21 and ridges'formingthe toothed ratchet I28 is such that the sliding link I50 is lockedagainst forward movement, due to the relative positions of the fulcrumpin I03 and the first groove I21, enforced by thespring I30.

Due to the same relative positions the -harrow the rear frame 3I' is intouch 30, and the thrust of the through the angling bar 163 main- Inother words, with this tractor I10 tains such parallelism.

setting of thedraft yoke I9, the gangs, of the D, the draft of the '40may now be backed in parallel position inasmuch I .as the bar 25 of vwith the stop member on continued forward motion of the tractor I10,

the operator from his seat on the tractor will pull the cord I40,whereby the portion I24, due to its rounded end fitting grooves I21 moreor less, will be easily released from the release permits the forwardmotionof the tractor rear gang I5, and to the front gang simultaneouslyby the forward movement of brace IOI with the sliding link I until thegangs reach the desired working angle, whereupon the cord I40. isreleased and the portion I24 of the lever pawl II2 drops into a groove mof the ratchet m and is locked there during forward motion of thetractor. As soon as the gangs are thus locked in forward motion, theharrow I5 as a whole swings in offset position entirely outside of theoutside edge of the tractor wheels and remains in such working position.

In this manner, a preferred mode of operation not only angles the gangssimultaneously but causes the harrow'to assume its offset position.

While the forces which cause this double function are not fullyunderstood, the result is highly desirable. inasmuch as the harrow I5may cultiratchet I25. Thisqws to be applied through the angling bar I03to the vate under low hanging branches of trees while the tractorcontinues down the center of a row of such trees and, furthermore, thefull-width of the harrow I5 is free to cultivate in sofl which is notpacked by the weight of the tractor to any de ree.

It is believed that ,the thrust of the soil against the disks of therear gang I6 when the same is first angled causes such offsetting,because such may be partially regulated by the position in which thesliding link I50 is locked and in consequence-varying the working angleof the rear gang I6, but in any event there may be other causes inobtaining the known results.

In many orchards, and particularly in orange orchards, the branches andfoliage of the trees are allowed to grow close to the ground and greatdifficulty has been hitherto encountered in the effort to cultivate theground close up to the trees without damaging the lower foliage of thetrees. In Fig. 11 a tree is indicated by the broken line I15, this treehaving a trunk I16. When the gangs of my harrow are in the workingposition L, the disks thereof sink into theground and the axle and frameportions of the gangs are disposed very close to the surface of theground. There being no superstructure which rises above the disks exceptalong the edge of the harrow near-.

est theltractor, the harrow is thus able to pass under the edge of thetree I15 close to the trunk I16 with practically no damage to the lowhanging foliage of the tree.

., This is an important feature of my invention as at present time thereare great lossesfrom the i 'i damaging of treesand the destruction offruit upon the trees in the endeavor to cultivate the earth up close tothe trunks thereof.

Further, if now it is desired to again pull the harrow I5 in parallelposition forgany reason,-

nothing need be done but stop the tractor and back the same withouttouching any part of the harrow, whereupon the thrust of the tractorwill force vthe gangs into parallelism simultaneously and on continuedforward motion the harrow II will be in the original position L, asshown in Fi 10.. I

Another important feature of my invention is the connection between thefront and rear gangs, 'which permits the angling of these gangs by arelatively short movement of the tractor relative to the harrow. Forinstance in Fig. 2 the position of the arm 52 when the harrow is in theposition 'L is indicated by the broken lines I11. The distance which itis necessary for the tractor to move relative to the harrow I5 in, orderto angle the gangs from the position L to the indicated by the letter H.This distance in actual practice is about2 feet-with a six-foot cut ofdisks and about 20 inches with afour-foot sixinch cut of disks, andpermits very quick manipulation of the harrow by the operator of thetractor. Also the restoring of the gangs to parallel positionisaccomplished by a backward movement of the tractor a distance Hrelative to the harrow I5, which distance by'the aboveflguresmay beseento be approximately one-third the width of the cut of the disks. 7

When it is desired to draw the harrow I5 behind the tractor IIII upon-ahighway, it is preferable' that the harrow trail behind in a nonbolts H8and replacing hese in different comcloser to the axles position L is''relative positions of theconcavities binations of the holes H1 and I20. In general the longer the brace IIII is made, the more offset theharrow I5 will obtain toward one side of the tractor and the shorter thebrace IIII is made,

the better the harrow tor path.

Practical reasons will dictate the limits to which the brace IIII willbe shortened but, as ,shown in Fig. 8, the shortening of the brace IIIIcan swing the central fore and aft axis of the whole harrow I5substantially in line with the central fore and aft axis of the tractor,or even beyond it to the opposite side. In fact the moving of the pointof application of l the tractive pull of the tractor to the harrow sothat this point lies substantially upon the fore and aft central axis ofthe harrow results in the harrow trailing directly behind the tractorwhen the harrow is in the non-Working position T.

When the harrow is desired to be brought into a working position T, thelever pawl 2' is released and the gangs are angled into workingposition, as previously described and now illustrated in Fig.9. 1

Thus the harrow I5 may be drawn in non working position T over anypublic highway and through gates and between other obstacles, where I5will follow in the tracit is necessary that the harrow trail directlybehind the tractor, and it may be quickly and easily extended in thefield to the non-working and working positions L and L for the purposeof cultivating underneath the foliage of trees or other low objects aspreviously described.

As above mentioned briefly, another important feature of my invention isthe flexible manner in which the front and rear gangs are connected atthe horizontal pivots 84 through the inter-. I

the 'disks of the rear gang be equal in number and size to the disks ofthe front gang. It is also necessary that the disks of the rear gangcultivate approximately intermediate of the disks of the front gang whenthe gangs are angled to working position.

To this end the pivot 95 is located at a point to the axles SI of thefront gang I1, or closer to lines forming the central axes of such, andlikewise close to the central fore and aft axis of the rear gang 3|.

Such construction permits the outermost disk 22 of the rear gang, on theend towards which the concavities of the disks pulled into angle tocultivate intermediate the to the end that 22' are opposed, to be.

Iii)x two outermost disks 60 of the front gang on.the

the rear gang I6 will then cut outside the outermost disk 60 of thefront gang I1.

The object of such construction, and ,of the as illustrated herein, isto first provide fox-angling and offsetting the front gang in the rightdirection by the action of the rear gang, and secondly to maintain asmooth even strip of cultivation,-the width of which equals the overallwidth of the harrow.

The first of these objects is accomplished ll ofthedisks' alreadydescribed, and the second is accomplished by the outermost overlappingdisks'on opposite ends of the gangs. throwing the soil in towards thecenter of the cultivated strip, due to the positions of the concavitiesof the disks. This eliminates ridges at the outside edges of suchcultivated strip.

Depending on soil conditions, it is sometimes desirable to changetheposition of the rear gang of disks with respect to the front gang ofdisks for varying the normal relative center cutting positions.

This is done by removing the bolts 39 from the bracket 32 and replacingthe same in other holes I. This causes the rear gang to be movedrelative to the front gang and permits the rear gang disks to cut of!center.

The limit to which the rear gang can be angled may be fixed by theposition of the member I36,

so that the member I55, on complete desired extension of the link I50,will come into contact with the member I36, thus permitting no furtherangling of the rear gang.

This is .of particular advantage when the driver of the tractor does notwish to, or cannot, look back as he has nothing to do except pull on thecord I40 until he hears the members I and I36 clash, when the cord maybe released.

I claim as my invention:

1. In an offset disk harrow, the combination of: a front frame, diskscarried by said frame, a rear frame, disks carried by said frame, meanspivotally connecting said frames together, and draft means adapted to besecured to a tractor; said draft means including a linkage connected toone part of the front frame and to the rear frame, and a bar ofadjustable length so connecting another part of the front frame to saidlinkage as to be movable relative to the front frame.

2. In an offset disk harrow, the combination of: a front'frame, diskscarried by said frame, a rear frame, disks carried by said frame, meanspivotally connecting said frames together, and draft means adapted to besecured to a tractor for simultaneously angling the frames: said draftmeans including a linkage connected to one part of the front frame andto the rear frame, and a bar of adjustable length connecting anotherpart of the front frame to said linkage.

3. In an offset disk harrow, the combination of:a front frame, diskscarried by said frame, a rear frame, disks carried by said frame, meanspivotally connecting said frames together, and draft means adapted to besecured to a tractor for simultaneously angling the frames and of!-setting the harrow from the tractor; said draft means including alinkage connected to one part of the front frame and to the rear frame,and a bar of adjustable length. connecting another part of the frontframe to said linkage.

4. In an oflset disk harrow, the combination of: a front frame, diskscarried by said frame, a rearframe. disks carried by said frame, meanspivotally connecting said frames together, a

linkage adapted to connect one part of the front I of: a front frame,disks carried by said frame,

frame and the rear frame to a tractor, an adjustable brace connectinganother part of the front frame to said linkage, and means to vary theposition of we linkage and said brace withrespect. to the front frame.

5. In an offset disk harrow, the combination age adapted to connect onepart of the front frame and the r'e'ar'frame to a tractor, an ad--justable brace connecting another part of the front frame to saidlinkage, a rigid bar connected to the front frame, and means to vary theposition of said linkage with respect to said rigid bar.

6. In an offset disk harrow, the combination of: a front frame, diskscarried by said frame, a rear frame, disks carried by said frame, meanspivotally connecting said frames together, a linkage adapted to connectone part of the front frame and the rear frame to a tractor, anadjustable brace connecting another part of the front frame to saidlinkage, a rigid bar connected to the front frame, and means to vary theposition of said linkage with respect to said rigid bar; said lastmentioned means including pawl and ratchet mechanism connecting saidrigid bar and said linkage to adjustably hold the same in lockedposition upon forward motion of the tractor and to permit the linkage tomove freely with respect to the rigid bar upon rearward motion of the,tractor.

'7. In an offset disk harrow, the combination of a front frame, diskscarried by said frame, a rear frame, disks carried by saidframe, meanspivotally connecting said frames together, draft means adapted to besecured to a tractor and attached to and acting upon the rear frame, abar of adjustable length connecting one part of the front frame to saiddraft means, and means for connecting the draft means to anotherpart ofthe front frame; said connecting means including a pawl and ratchetmechanism.

8. In .an offset disk harrow, the combination of: a'front frame, diskscarried by said frame. a rear frame, disks carriedby said frame, meanspivotally connecting said frames together, draft means adapted to besecured to a tractor and attached to and acting'upon the rear frame, abar of adjustable length connecting one part of the front frame to saiddraft means, and means for connecting the draft means to another part ofthe front frame; said connecting means includ-,

ing a pawl and'ratchet mechanism adapted to adjustably hold the framesin locked position upon forward motion of the tractor and to permit freemovement ofthe frames upo'n rearward motionof the tractor.

9. In an offset disk harrow, the combination of: a front frame,-diskscarried by said frame, a rear frame, disks carried by said frame, meanspivotally connecting said frames together, draft means adapted to besecured to a tractor and attached to and acting upon the rear frame, abar of adjustable length connecting one part of the front frame to saiddraft means, a rigid bar fastened to another part of the front frame;and means for connecting said rigid bar and said draft means; saidconnecting means including a ratchet member coacting with said draftmeans to lock said frames upon forward motion of, the tractor andtopermit free movement of the frames upon rearward'motion of thetractor.

10. In an offset disk harrow, the combination a rear frame, diskscarried by said frame, means pivotally connecting said frames together,and draft means adapted to be secured to a tractor; said draftmeans-including a rigid bar of variable length connected to one part ofthe front frame, a linkage of invariable length connected to the rearframe and the rigid bar and slidably connected to the front frame atanother part, and a ratchet member connecting the front frame andlinkage to lock the same upon forward motion'of the tractor and permitfree movement of the link age uponrearward motion of the tractor.

"11. In an offset diskharrow, the combination of z a front frame, diskscarried by said frame, a

rear frame, disks-carriedby said frame, means pivotally connecting saidframes together, and

draft means adapted to be secured to a tractor;

Said draft means including a linkage of variable length connected to onepart of the front frame,

a linkage of invariable lengthconnected to .another part of the frontframe and to the rear frame, and means to vary the position of the 1'5linkages with respect to the front frame to move an outer disk of therear frame a distance approximating one-third of the distance betweenthe cutting edges of the two outside disks in th of: a front frame,disks carried by said frame, a rear frame, disks carried by said frame,means pivotally connecting .said frames together, and

draft means adaptedto be secured to a tractor;

said draft means including a linkage of variable length connected to onepart of the front frame, a linkage of invariable length connected toanother part of the front frame and to the rear frame, and means to varythe position of the linkages with respect to the front frame to reducethe distance between an end disk of each frame an amount approximatingone-third of the distance between the cutting edges of the two outsidedisks in the 'rear frame.

gether, and means adapted to connect the frames to a' tractor; saidmeans including a link connected to the rear frame, a guide on thefrontframe for said link, means to, laterally adjust the position ofsaid link, and means to lock said guide and link in fixed position andto automatically permitflree movement of the link upon rearward motionof the tractor. g

14. In a harrow, the combination of a front frame c rying disks, a rearframe carrying disks, means pivotally connecting said frames together,and means adapted toconnect the frames to a tractor; said meansincluding a link connected to the rear frame, a guide on the front framefor said link, means ,to laterally adjust the position of said link,means to lock said guide and link in fixed position and to automaticallypermit free movement of the link upon rearward motion of the tractor,and means to release said lo'ck. 15. In a harrow, the combination of afront frame carrying disks, arear frame carrying disks,

motion of thetractor.

' SAMUEL S. FURRER.

